Dispensing – Processes of dispensing
Reexamination Certificate
1999-08-24
2001-02-20
Jacyna, J. Casimer (Department: 3751)
Dispensing
Processes of dispensing
C222S135000, C222S145500, C222S309000, C222S334000, C222S401000, C222S394000
Reexamination Certificate
active
06189735
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention is relative to a method for the extrusion of a polymeric substance.
As already known, the polymerization of a monomeric substance emission from a container occurs in many cases due to the effect of the mixing of the same substance, before the output from the same container, with a prefixed quantity of a certain liquid, for example, constituted by additive water or at least with other substances or other liquids which are different in dependence from the type of monomeric substance in question.
The said liquid, when simple water, is usually supplied from air humidity in the case of single component extruder, that is to say, extruders containing only the monomeric substance inside, or is supplied following the break of a small tank housed in the container in the case of the so called “double-component” extrusion (obviously, this solution is valid for any type of liquid).
This second process should be considered as being of high technical value, as, on the contrary to what occurs with the first process, the liquid contained in the aforementioned container can be intimately mixed with the entire mass of the monomeric substance, assuring the subsequent uniform and simultaneous polymerization in all zones.
However, this second procedure has a considerable inconvenience which consists in the fact that after the mixing of the monomeric substance with the liquid, there is only a very brief period of time available (some minutes), in which the whole mass completes its polymerization. This means that, if for any such reason it has not been possible to proceed to the whole substance extrusion housed in the container, the polymerized quantity left in the same container, hardens and so becomes useless.
Therefore, independently, from the objective use requirements, in a polymeric substance extrusion container which functions in the above described method, within a few minutes the unextruded mass is no longer able to be used, and constitutes together with its container “special waste”which is complicated and expensive to dispose of.
SUMMARY OF THE INVENTION
In order to use the two-component process without encountering the above mentioned inconveniences, the aim of the present invention is to supply a simple and economic invention , and a device which accomplishes such a method, suitable to permit the use, by obtaining an excellent polymerisation, only the quantity of monomeric substance necessary from time to time, without prejudicing at all the substance characteristics which provisionally remain unused in a container, in order to permit the use when necessary.
Moreover, the result is that any type of operation including the extrusion of a polymeric substance is able to be effected, using the proposed method and the device, with the due care and attention, without the harassment of having to use the whole container load within a prefixed time limit. According to the present invention, a method is supplied for the extrusion of a polymeric substance, characterized by the fact of including the phases of determining the outflow, from a first pressurized container making part of a device for the extrusion of the polymeric substance itself, of a monomeric substance able to autonomally polymerize upon air contact; if desired, to determine the outflow from a second container that, when the said device is not in use, is not pressurized, of a hardening substance able to accelerate the polymerization of the monomeric substance; and sending the same hardening substance towards a mixing zone of the hardening substance itself with the monomeric substance.
Moreover, the present invention is relative to an extrusion device for a polymeric substance.
According to the present invention, a device is realized for the extrusion of a polymeric substance, characterized by the fact of comprising a first pressurized container housing internally a monomeric substance able to autonomously polymerize one in air contact; a second container suitable for housing internally a hardening substance able to accelerate the polymerization of the monomeric substance, the second container, when the device is not in use, being not pressurized; a first conduit suitable to conduct the monomeric substance towards the output station of the monomeric substance itself from the device, and a second conduit suitable, if desired, to conduct the outflowing hardening substance from the second container towards a mixing zone of the hardening substance itself with the monomeric substance; the device also comprising first obstruction means suitable to determine, on command, the outflow of the monomeric substance from the device itself, and second obstruction means suitable to determine, on command, the sending of the hardening substance eventually present within the second container towards the mixing zone.
According to the present invention, a device is realized for a polymeric substance extrusion which is characterised by the fact of including a first container housing within its' internal, a monomeric substance able to autonomously polymerize once put into contact with air;and a second container suitable to house a hardening substance in its internal which is able to accelerate the polymerization of the said monomeric substance, and a first conduit suitable to drive the said monomeric substance towards an output station of the same monomeric substance of said device, and a second conduit suitable to conduct the hardening substance eventually outflowing from said second container towards a mixing zone of the same hardening substance with the said monomeric substance; and the first obstruction means being provided which are suitable to determine, on comand, the outflow of the said monomeric substance from the said device, and the second obstruction means suitable to determine, on comand, the sending of the hardening substance eventually present within the said second container towards the said mixing zone.
REFERENCES:
patent: 3541023 (1970-11-01), Cole, III
patent: 4341327 (1982-07-01), Zeitz
patent: 4955544 (1990-09-01), Kopp
patent: 5092492 (1992-03-01), Centea
patent: 5224629 (1993-07-01), Hsich
patent: 5566860 (1996-10-01), Schiltz
patent: 5791522 (1998-08-01), Lee et al.
patent: 5857589 (1999-01-01), Cline et al.
Cheming S.A. Luxembourg
Jacyna J. Casimer
Young & Thompson
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